MPInteger.cs :  » PDF » iTextSharp » Org » BouncyCastle » Bcpg » C# / CSharp Open Source

using System;
using System.IO;

using Org.BouncyCastle.Math;

namespace Org.BouncyCastle.Bcpg{
  /// <remarks>A multiple precision integer</remarks>
    public class MPInteger
        : BcpgObject
    {
        private readonly BigInteger val;

        public MPInteger(
            BcpgInputStream bcpgIn)
        {
      if (bcpgIn == null)
        throw new ArgumentNullException("bcpgIn");

      int length = (bcpgIn.ReadByte() << 8) | bcpgIn.ReadByte();
            byte[] bytes = new byte[(length + 7) / 8];

            bcpgIn.ReadFully(bytes);

            this.val = new BigInteger(1, bytes);
        }

    public MPInteger(
            BigInteger val)
        {
      if (val == null)
        throw new ArgumentNullException("val");
      if (val.SignValue < 0)
        throw new ArgumentException("Values must be positive", "val");

      this.val = val;
        }

    public BigInteger Value
        {
            get { return val; }
        }

        public override void Encode(
            BcpgOutputStream bcpgOut)
        {
      bcpgOut.WriteShort((short) val.BitLength);
      bcpgOut.Write(val.ToByteArrayUnsigned());
        }

    internal static void Encode(
      BcpgOutputStream  bcpgOut,
      BigInteger      val)
    {
      bcpgOut.WriteShort((short) val.BitLength);
      bcpgOut.Write(val.ToByteArrayUnsigned());
    }
    }
}